How to change WPF datepicker culture?

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I have a WPF application on the dotnet core 7 platform and in the App class, in the OnStartup event, I have changed the Culture as follows: When I use DatePicker, when I click on the date selection button, it shows me the Persian calendar correctly. However, when I select a date, it displays the Gregorian date in Persian numbers. When I click on the year at the top of the page to select the date, it shows me the Gregorian months in Persian. Then, when I click again, it shows me the Gregorian years. What should I do to solve this problem? I have attached a sample image of the program running.

problem image

What I have tried:

<pre>protected override void OnStartup(StartupEventArgs e)
{
    CultureInfo cultureInfo = new CultureInfo("fa-IR");
    Thread.CurrentThread.CurrentCulture = cultureInfo;
    Thread.CurrentThread.CurrentUICulture = cultureInfo;

    FrameworkElement.LanguageProperty.OverrideMetadata(typeof(FrameworkElement), new FrameworkPropertyMetadata(XmlLanguage.GetLanguage(CultureInfo.CurrentCulture.IetfLanguageTag)));
}
---
...
<StackPanel FlowDirection="RightToLeft" VerticalAlignment="Center" Margin="10,0,10,0" Height="209">
    <DatePicker />
...

Posted 23-Sep-23 2:16am

mohsen saleh

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Graeme_Grant · Answer 1 · 2023-09-23T03:09:00

Localization with WPF require you to set the text to be used as there are no language translations by default. Here is a search show a number of ways of doing it: wpf mulitiple language support - Google Search[^] and here is an article on CP that demonstates one way: Simplest Way to Implement Multilingual WPF Application[^]

Now, regarding your issue with the DatePicker control. There are two parts:
1. The calendar month and the abbreviated day-of-week names - you have a solution already - simply set the culture.

2. Altering the TextBox text message to a localize message.
You have 2 choices:
a) extract and create your own template - not ideal
b) to progmatically change the text with your own - this is the method that I will demonstrate below.

Here is a working solution...

XAML

XML

<DatePicker x:Name="MyDatePicker"
            Loaded="MyDatePicker_OnLoaded"
            HorizontalAlignment="Center"
            VerticalAlignment="Top"
            Width="200"/>

Code-Behind:

C#

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();

        CultureInfo cultureInfo = new CultureInfo("fa-IR");
        Thread.CurrentThread.CurrentCulture = cultureInfo;
        Thread.CurrentThread.CurrentUICulture = cultureInfo;

    }


    private void MyDatePicker_OnLoaded(object sender, RoutedEventArgs e)
    {
        DatePicker datePicker = sender as DatePicker;
        if (datePicker is null)
            return;

        DatePickerTextBox pickerTextBox =
            datePicker.GetChildOfType<DatePickerTextBox>();

        if (pickerTextBox is null)
            return;

        ContentControl contentControl = pickerTextBox
            .Template
            .FindName("PART_Watermark", pickerTextBox) as ContentControl;

        if (contentControl is null)
            return;

        contentControl.Content = "تاریخ را انتخاب کنید";
    }
}

Extension Method:

C#

public static class DependencyObjectExtensions
{
    public static T GetChildOfType<T>(this DependencyObject depObj) 
        where T : DependencyObject
    {
        if (depObj == null) return null;

        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
        {
            var child = VisualTreeHelper.GetChild(depObj, i);

            var result = (child as T) ?? GetChildOfType<T>(child);
            if (result != null) return result;
        }
        return null;
    }
}

I have hard-coded the text in the example. If you're only using one language, this is fine. If not, refer to the links at the beginning of this solution.